https://x.com/runasand/status/2017659019251343763?s=20
The FBI was able to access Washington Post reporter Hannah Natanson's Signal messages because she used Signal on her work laptop. The laptop accepted Touch ID for authentication, meaning the agents were allowed to require her to unlock it.
Yes, a judge is unlikely to order your execution if you refuse. Based on recent pattern of their behavior, masked secret police who are living their wildest authoritarian dreams are likely to execute you if you anger them (for example by refusing to comply with their desires).